<li><a href="<?php echo site_url('center');?>" target="main" id="resources"><span>资源中心</span></a></li>
    <li><a href="<?php echo site_url('auth/change_password');?>"  target="main" id="change"><span>密码修改</span></a></li>
    <li class="last"><a href="<?php echo site_url('auth/logout');?>" id="logout"><span>退出</span></a></li>